November should have its own colors.

[sil3nt j]

Something to keep the change going in between October and December? Maybe Orange and Yellow?

[Petie]

Skinning the main sites is currently very difficult. We’re working on a way to make this easier but it’s a ways off at the moment. As for the forum, given it’s limited use, we don’t typically devote many development resources to it at this point.

[Dolphman]

Not only that, but November has different events depending on the country. In Australia we have Melbourne Cup Day on every first Tuesday. The UK they have Guy Fawkes Night every 5th.
And of course, America has Thanksgiving on every last Thursday. So yeah, there really isn't any way to have a theme for November due to different regional traditions.